Geological map of the Sagavanirktok B-1 Quadrangle, eastern North Slope, Alaska

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Frequently-anticipated questions:

What does this data set describe?

Title:
Geological map of the Sagavanirktok B-1 Quadrangle, eastern North Slope, Alaska
Abstract:
Alaska Division of Geological & Geophysical Surveys (DGGS) has conducted 1:63,360-scale geologic mapping of the Sagavanirktok B-1 Quadrangle (640 square km—equivalent to four 7.5 minute quadrangles). This geologic map was produced by merging a bedrock geologic map and a surficial geologic map of the Eagle A-2 Quadrangle. This mapping project reinterprets micropaleontologic correlations for 17 Sagavanirktok Quadrangle wells, and reprocesses data from the one publicly-available seismic line. Surface geologic mapping, subsurface-to-surface stratigraphic age control, and seismic framework are required to reliably decipher the complex geology of this key area of the Brooks Range. Outcrops within the Sagavanirktok B-1 Quadrangle are the closest surface expressions of Prudhoe Bay source and reservoir rocks. This study yields critical petroleum-related information from these surface exposures, and how they relate to the area subsurface stratigraphy.
Supplemental_Information:
The layers listed below are present as ArcGIS shape files. Attribute information for the following layers (entities) is included in this metadata file under the "Entity_and_Attribute_Information" section. Each layer is listed and described in detail under its own heading starting "Entity_Type_Label." Basic unit information is also included in the geologic unit code set file "RI2000-1_codeset.pdf." Layers include: 
anwr_arc     boundary of the Arctic National Wildlife Refuge
bedding_point     lineaments and bedding planes
cleavage_point     strike and dip of bedding cleavage
estbed_point     estimated bedding planes
joints_point     joints
newsagcomp_polygon     comprehensive geologic units
sagbed_arc     geologic bedrock contacts under surficial geology (arc)
sagbed_polygon     geologic bedrock contacts under surficial geology (polygon)
sagd-holes_point     locations of industry-drilled test wells
sagfold_arc     fold axis (anticline or syncline) traces (arc)
sagfold_point     fold axis (anticline or syncline) traces (point)
sagstr_arc     fault contacts
  1. How should this data set be cited?

    Reifenstuhl, R.R., Mull, C.G., Harris, E.E., LePain, D.L., Pinney, D.S., and Wallace, W.K., 2000, Geological map of the Sagavanirktok B-1 Quadrangle, eastern North Slope, Alaska: Report of Investigation RI 2000-1A, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, AK.

    Online Links:

    Other_Citation_Details: 15 p., 1 sheet, scale 1:63,360

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -147.606990
    East_Bounding_Coordinate: -147.000000
    North_Bounding_Coordinate: 69.501031
    South_Bounding_Coordinate: 69.248958

  3. What does it look like?

  4. Does the data set describe conditions during a particular time period?

    Beginning_Date: 1999
    Ending_Date: 2000
    Currentness_Reference: publication date

  5. What is the general form of this data set?

    Geospatial_Data_Presentation_Form: document, map, vector digital data

  6. How does the data set represent geographic features?

    1. How are geographic features stored in the data set?

    2. What coordinate system is used to represent geographic features?

      Grid_Coordinate_System_Name: Universal Transverse Mercator
      Universal_Transverse_Mercator:
      UTM_Zone_Number: 6
      Transverse_Mercator:
      Scale_Factor_at_Central_Meridian: 0.9996
      Longitude_of_Central_Meridian: -147.000
      Latitude_of_Projection_Origin: 0.0
      False_Easting: 500000
      False_Northing: 0.0

      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 0.000032
      Ordinates (y-coordinates) are specified to the nearest 0.000032
      Planar coordinates are specified in meters

      The horizontal datum used is D_Clarke_1866.
      The ellipsoid used is Clarke 1866.
      The semi-major axis of the ellipsoid used is 6378206.400000.
      The flattening of the ellipsoid used is 1/294.978698.

  7. How does the data set describe geographic features?

    anwr_arc.shp
    Object type is vector, there are no attributes associated with this entity, and the entity refers to the border of the Arctic National Wildlife Refuge (Source: Alaska Division of Geological & Geophysical Surveys)

    bedding_point.shp
    Object type is point, there are 270 rows associated with this entity, and the entity refers to lineaments and bedding planes (Source: Alaska Division of Geological & Geophysical Surveys)

    CODE
    Arbitrary number assigned to the given station (Source: Alaska Division of Geological & Geophysical Surveys)

    Unique sample number designated by the author(s)

    STATION
    Generic example of unique sample identifier or location of a geologic measurement: YrAAA999X: Yr=2 digit year of sample collection, AAA=geologist's initials (one to three characters), 999=unique station number, X=unique alpha character designating a sample was taken at the field station. Geologists' initials are: MU - C.G. Mull, RR - R. Reifenstuhl, DD - Unknown, DL - D. LePain, Ha - E. Harris, WW - W. Wallace. (Source: Alaska Division of Geological & Geophysical Surveys)

    Unique sample number designated by the author(s).

    SHOW
    Indicates whether or not the point is printed on the published paper map (Source: Alaska Division of Geological & Geophysical Surveys)

    "y" - The point is printed or shown on the Geological map of the Sagavanirktok B-1 Quadrangle, eastern North Slope, Alaska (Publication RI2000-1A-SH1). "n" - The point is not printed or shown on the Geological map of the Sagavanirktok B-1 Quadrangle, eastern North Slope, Alaska (Publication RI2000-1A-SH1). A value of "n" may indicate that a duplicate value was measured nearby or the point was simply omitted at the discretion of the author(s).

    B1
    Indicates whether or not the point is located within the Sagavanirktok B1 quadrangle (Source: Alaska Division of Geological & Geophysical Surveys)

    "y" - The point is printed or shown on the Geological map of the Sagavanirktok B-1 Quadrangle, eastern North Slope, Alaska (Publication RI2000-1A-SH1). "n" - The point is not printed or shown on the Geological map of the Sagavanirktok B-1 Quadrangle, eastern North Slope, Alaska (Publication RI2000-1A-SH1). A value of "n" may indicate that a duplicate value was measured nearby or the point was simply omitted at the discretion of the author(s).

    STRIKE
    Strike of plane using "Right-hand rule," where north is 0 and degrees increase clockwise to 360, always 90 degrees counter-clockwise from dip direction (Source: Alaska Division of Geological & Geophysical Surveys)

    Range of values
    Minimum:0
    Maximum:351
    Units:degrees

    DIP
    Degrees that a bedding plane is inclined relative to horizontal, horizontal being 0 degrees, vertical being 90 degrees; always 90 degrees clockwise from strike (Source: Alaska Division of Geological & Geophysical Surveys)

    Range of values
    Minimum:0
    Maximum:88
    Units:degrees

    UP?
    Indicates whether or not the top of the bed was identified from bedding features (Source: Alaska Division of Geological & Geophysical Surveys)

    "u" - It was undecided whether or not the top of the bed could be identified from bedding features. "Y" - The top of the bed could be identified from bedding features. "N" - The top of the bed could not be identified from bedding features. "Y?" - The top of the bed was likely identified from bedding features.

    SYMBOL
    Point symbol signifying strike and dip of bedding features and various lineaments (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    1Strike and dip
    2Strike and dip, approximate
    3Strike and dip of beds
    4Strike and dip, overturned
    7Bearing of lineation
    27Overturned anticline

    ANGLE
    Dip direction measured counter-clockwise from north (Source: Alaska Division of Geological & Geophysical Surveys)

    Range of values
    Minimum:0
    Maximum:358
    Units:degrees

    cleavage_point.shp
    Object type is point, there are 19 rows associated with this entity, and the entity refers to strike and dip of bedding cleavage (Source: Alaska Division of Geological & Geophysical Surveys)

    CODE
    Arbitrary number assigned to the given station (Source: Alaska Division of Geological & Geophysical Surveys)

    Unique sample number designated by the author(s)

    STATION
    Generic example of unique sample identifier or location of a geologic measurement: YrAAA999X: Yr=2 digit year of sample collection, AAA=geologist's initials (one to three characters), 999=unique station number, X=unique alpha character designating a sample was taken at the field station. Geologists' initials are: DL - D. LePain, Ha - E. Harris, WW - W. Wallace. (Source: Alaska Division of Geological & Geophysical Surveys)

    Unique sample number designated by the author(s).

    SHOW
    Indicates whether or not the point is printed on the published paper map (Source: Alaska Division of Geological & Geophysical Surveys)

    "y" - The point is printed or shown on the Geological map of the Sagavanirktok B-1 Quadrangle, eastern North Slope, Alaska (Publication RI2000-1A-SH1). "n" - The point is not printed or shown on the Geological map of the Sagavanirktok B-1 Quadrangle, eastern North Slope, Alaska (Publication RI2000-1A-SH1). A value of "n" may indicate that a duplicate value was measured nearby or the point was simply omitted at the discretion of the author(s).

    B1
    Indicates whether or not the point is located within the Sagavanirktok B1 quadrangle (Source: Alaska Division of Geological & Geophysical Surveys)

    "y" - The point is printed or shown on the Geological map of the Sagavanirktok B-1 Quadrangle, eastern North Slope, Alaska (Publication RI2000-1A-SH1). "n" - The point is not printed or shown on the Geological map of the Sagavanirktok B-1 Quadrangle, eastern North Slope, Alaska (Publication RI2000-1A-SH1). A value of "n" may indicate that a duplicate value was measured nearby or the point was simply omitted at the discretion of the author(s).

    STRIKE
    Strike of plane using "Right-hand rule," where north is 0 and degrees increase clockwise to 360, always 90 degrees counter-clockwise from dip direction (Source: Alaska Division of Geological & Geophysical Surveys)

    Range of values
    Minimum:6
    Maximum:352
    Units:degrees

    DIP
    Degrees that a bedding plane is inclined relative to horizontal, horizontal being 0 degrees, vertical being 90 degrees; always 90 degrees clockwise from strike (Source: Alaska Division of Geological & Geophysical Surveys)

    Range of values
    Minimum:18
    Maximum:90
    Units:degrees

    SYMBOL
    Point symbol signifying strike and dip of bedding features and various lineaments (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    12Strike and dip of bedding cleavage

    CNTRCLK
    360 minus the strike value, where north is 0 and degrees increase clockwise to 360, always 90 degrees counter-clockwise from dip direction (Source: Alaska Division of Geological & Geophysical Surveys)

    Range of values
    Minimum:8
    Maximum:354
    Units:degrees

    ANGLE
    Dip direction measured counter-clockwise from north (Source: Alaska Division of Geological & Geophysical Surveys)

    Range of values
    Minimum:15
    Maximum:359
    Units:degrees

    estbed_point.shp
    Object type is point, there are 35 rows associated with this entity, and the entity refers to estimated bedding planes (Source: Alaska Division of Geological & Geophysical Surveys)

    CODE
    Unknown (Source: Alaska Division of Geological & Geophysical Surveys)

    Unknown

    STRIKE
    Strike of plane using "Right-hand rule," where north is 0 and degrees increase clockwise to 360, always 90 degrees counter-clockwise from dip direction (Source: Alaska Division of Geological & Geophysical Surveys)

    Range of values
    Minimum:65
    Maximum:360
    Units:degrees

    DIP
    Degrees that a bedding plane is inclined relative to horizontal, horizontal being 0 degrees, vertical being 90 degrees; always 90 degrees clockwise from strike (Source: Alaska Division of Geological & Geophysical Surveys)

    Range of values
    Minimum:0
    Maximum:99
    Units:degrees

    SHOW
    Indicates whether or not the point is printed on the published paper map (Source: Alaska Division of Geological & Geophysical Surveys)

    "y" - The point is printed or shown on the Geological map of the Sagavanirktok B-1 Quadrangle, eastern North Slope, Alaska (Publication RI2000-1A-SH1). "n" - The point is not printed or shown on the Geological map of the Sagavanirktok B-1 Quadrangle, eastern North Slope, Alaska (Publication RI2000-1A-SH1). A value of "n" may indicate that a duplicate value was measured nearby or the point was simply omitted at the discretion of the author(s).

    B1
    Indicates whether or not the point is located within the Sagavanirktok B1 quadrangle (Source: Alaska Division of Geological & Geophysical Surveys)

    "y" - The point is printed or shown on the Geological map of the Sagavanirktok B-1 Quadrangle, eastern North Slope, Alaska (Publication RI2000-1A-SH1). "n" - The point is not printed or shown on the Geological map of the Sagavanirktok B-1 Quadrangle, eastern North Slope, Alaska (Publication RI2000-1A-SH1). A value of "n" may indicate that a duplicate value was measured nearby or the point was simply omitted at the discretion of the author(s).

    UP?
    Indicates whether or not the top of the bed was identified from bedding features (Source: Alaska Division of Geological & Geophysical Surveys)

    "u" - It was undecided whether or not the top of the bed could be identified from bedding features.

    SYMBOL
    Point symbol signifying strike and dip of bedding features and various lineaments (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    8Horizontal beds
    74Estimated bedding

    X-COORD
    Longitude (UTM) of sample location (Source: Alaska Division of Geological & Geophysical Surveys)

    Range of values
    Minimum:482694.2
    Maximum:499624.9
    Units:meters

    Y-COORD
    Latitude (UTM) of sample location (Source: Alaska Division of Geological & Geophysical Surveys)

    Range of values
    Minimum:7682675
    Maximum:7691176
    Units:meters

    ANGLE
    Dip direction measured counter-clockwise from north (Source: Alaska Division of Geological & Geophysical Surveys)

    Range of values
    Minimum:0
    Maximum:350
    Units:degrees

    joints_point.shp
    Object type is point, there are 7 rows associated with this entity, and the entity refers to joint locations and related measurements (Source: Alaska Division of Geological & Geophysical Surveys)

    CODE
    Arbitrary number assigned to the given station (Source: Alaska Division of Geological & Geophysical Surveys)

    Unique sample number designated by the author(s)

    STATION
    Generic example of unique sample identifier or location of a geologic measurement: YrAAA999X: Yr=2 digit year of sample collection, AAA=geologist's initials (one to three characters), 999=unique station number, X=unique alpha character designating a sample was taken at the field station. Geologists' initials are: DL - D. LePain, RR - R. Reifenstuhl, WW - W. Wallace. (Source: Alaska Division of Geological & Geophysical Surveys)

    Unique sample number designated by the author(s).

    SHOW
    Indicates whether or not the point is printed on the published paper map (Source: Alaska Division of Geological & Geophysical Surveys)

    "y" - The point is printed or shown on the Geological map of the Sagavanirktok B-1 Quadrangle, eastern North Slope, Alaska (Publication RI2000-1A-SH1). "n" - The point is not printed or shown on the Geological map of the Sagavanirktok B-1 Quadrangle, eastern North Slope, Alaska (Publication RI2000-1A-SH1). A value of "n" may indicate that a duplicate value was measured nearby or the point was simply omitted at the discretion of the author(s).

    B1
    Indicates whether or not the point is located within the Sagavanirktok B1 quadrangle (Source: Alaska Division of Geological & Geophysical Surveys)

    "y" - The point is printed or shown on the Geological map of the Sagavanirktok B-1 Quadrangle, eastern North Slope, Alaska (Publication RI2000-1A-SH1). "n" - The point is not printed or shown on the Geological map of the Sagavanirktok B-1 Quadrangle, eastern North Slope, Alaska (Publication RI2000-1A-SH1). A value of "n" may indicate that a duplicate value was measured nearby or the point was simply omitted at the discretion of the author(s).

    STRIKE
    Strike of joint using "Right-hand rule," where north is 0 and degrees increase clockwise to 360, always 90 degrees counter-clockwise from dip direction (Source: Alaska Division of Geological & Geophysical Surveys)

    Range of values
    Minimum:40
    Maximum:195
    Units:degrees

    DIP
    Degrees that a joint plane is inclined relative to horizontal, horizontal being 0 degrees, vertical being 90 degrees; always 90 degrees clockwise from strike (Source: Alaska Division of Geological & Geophysical Surveys)

    Range of values
    Minimum:50
    Maximum:88
    Units:degrees

    SYMBOL
    Point symbol signifying strike and dip of bedding features and various lineaments (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    19Strike and dip of joints

    ANGLE
    Dip direction measured counter-clockwise from north (Source: Alaska Division of Geological & Geophysical Surveys)

    Range of values
    Minimum:75
    Maximum:230
    Units:degrees

    newsagcomp_polygon.shp
    Object type is vector, there are 527 rows associated with this entity, and the entity refers to bedrock and surficial map unit boundaries (Source: Alaska Division of Geological & Geophysical Surveys)

    UNIT
    Bedrock and surficial map unit names, any unit ending with a "?" indicates uncertainty (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    PMlm***Note: The unit label "PMlm" shown in the legend and in the map area on the Geological map of the Sagavanirktok B-1 Quadrangle, eastern North Slope, Alaska (Publication RI2000-1A-SH1) should be labeled as "IPMlm".***
    PMlu***Note: The unit label "PMlu" shown in the legend and in the map area on the Geological map of the Sagavanirktok B-1 Quadrangle, eastern North Slope, Alaska (Publication RI2000-1A-SH1) should be labeled as "IPMlu".***
    Qu***Note: The unit label "Qu" listed in the attribute table "newsagcomp_polygon.shp" with the software-defined attribute/column FID whose values are 211 and 283 should be labeled as "Qa".***
    lakelake

    Formal codeset
    Codeset Name:RI2000-1_codeset.pdf
    Codeset Source:Alaska Division of Geological & Geophysical Surveys <http://www.dggs.alaska.gov/metadata/RI2000-1_codeset.pdf>

    sagbed_arc.shp
    Object type is vector, there are 408 rows associated with this entity, and the entity refers to bedrock unit boundaries (Source: Alaska Division of Geological & Geophysical Surveys)

    CODE
    Line symbols for contacts, defined as boundaries between geologic formations or other rock units (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    0hidden line, defines the polygon boundary, but is not displayed on the map for aesthetic purposes
    4Bounding box and neatlines
    5contact
    7contact, inferred
    9contact, concealed

    sagbed_polygon.shp
    Object type is vector, there are 66 rows associated with this entity, and the entity refers to bedrock units (Source: Alaska Division of Geological & Geophysical Surveys)

    UNIT
    Bedrock map unit names, any unit ending with a "?" indicates uncertainty (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    PMlm***Note: The unit label "PMlm" shown in the legend and in the map area on the Geological map of the Sagavanirktok B-1 Quadrangle, eastern North Slope, Alaska (Publication RI2000-1A-SH1) should be labeled as "IPMlm".***
    PMlu***Note: The unit label "PMlu" shown in the legend and in the map area on the Geological map of the Sagavanirktok B-1 Quadrangle, eastern North Slope, Alaska (Publication RI2000-1A-SH1) should be labeled as "IPMlu".***
    Qu***Note: The unit label "Qu" listed in the attribute table "sagbed_polygon.shp" with the software-defined attribute/column FID whose values are 211 and 283 should be labeled as "Qa".***
    lakelake

    Formal codeset
    Codeset Name:RI2000-1_codeset.pdf
    Codeset Source:Alaska Division of Geological & Geophysical Surveys <http://www.dggs.alaska.gov/metadata/RI2000-1_codeset.pdf>

    BUNIT
    Bedrock map unit names, any unit ending with a "?" indicates uncertainty (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    PMlm***Note: The unit label "PMlm" shown in the legend and in the map area on the Geological map of the Sagavanirktok B-1 Quadrangle, eastern North Slope, Alaska (Publication RI2000-1A-SH1) should be labeled as "IPMlm".***
    PMlu***Note: The unit label "PMlu" shown in the legend and in the map area on the Geological map of the Sagavanirktok B-1 Quadrangle, eastern North Slope, Alaska (Publication RI2000-1A-SH1) should be labeled as "IPMlu".***
    Qu***Note: The unit label "Qu" listed in the attribute table "sagbed_polygon.shp" with the software-defined attribute/column FID whose values are 211 and 283 should be labeled as "Qa".***
    lakelake

    Formal codeset
    Codeset Name:RI2000-1_codeset.pdf
    Codeset Source:Alaska Division of Geological & Geophysical Surveys <http://www.dggs.alaska.gov/metadata/RI2000-1_codeset.pdf>

    sagd-holes_point.shp
    Object type is point, there are no attributes associated with this entity, and the entity refers to locations of industry-drilled test wells (Source: Alaska Division of Geological & Geophysical Surveys)

    sagfold_arc.shp
    Object type is vector, there are 87 rows associated with this entity, and the entity refers to fold axis (anticline or syncline) traces (Source: Alaska Division of Geological & Geophysical Surveys)

    CODE
    Line symbols for fold axis (anticline or syncline) traces (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    13fault, inferred
    35fold axis, approximately located

    sagfold_point.shp
    Object type is point, there are 117 rows associated with this entity, and the entity refers to types of fold axes (anticline or syncline) (Source: Alaska Division of Geological & Geophysical Surveys)

    CODE
    Line symbols for fold axis (anticline or syncline) traces (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    22anticline
    23syncline
    26overturned syncline
    59glacial outwash
    75anticline, both limbs dipping in the same direction, double arrows on steeper limb. ***Note: the point symbol displayed in the legend for this feature is correct. This feature is incorrectly displayed as a shaded diamond in the map area.***
    76syncline, both limbs dipping in the same direction, double arrows on steeper limb. ***Note: the point symbol displayed in the legend for this feature is correct. This feature is incorrectly displayed as a diagonally half-shaded square in the map area.***
    77anticline, double arrows on steeper limb
    78syncline, double arrows on steeper limb

    sagstr_arc.shp
    Object type is vector, there are 158 rows associated with this entity, and the entity refers to fault contacts (Source: Alaska Division of Geological & Geophysical Surveys)

    CODE
    Line symbols for fold axis (anticline or syncline) traces (Source: Alaska Division of Geological & Geophysical Surveys)

    ValueDefinition
    11cross section lines
    13fault, inferred
    19thrust fault, inferred

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)

  2. Who also contributed to the data set?

    Funding for the geologic mapping was provided by the U.S. Geological Survey, National Cooperative Geologic Mapping Program, under STATEMAP award number 99HQAG0121 under the NCGM STATEMAP program for FY1999. The views and conclusions contained in this document are those of the authors and should not be interpreted as necessarily representing the official policies, either expressed or implied, of the U.S. Additional Acknowledgments: Map reviewed by R.F. Swenson and M.T. Whalen. Electronic cartography by A.G. Sturmann and B.G. Gage.

  3. To whom should users address questions about the data?

    State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys
    GIS Data Manager/Cartographer
    3354 College Road
    Fairbanks, AK 99709-3707

    (907) 451-5029 (voice)
    (907) 451-5050 (FAX)
    dggspubs@alaska.gov

    Contact_Instructions:
    You may view our web site at <http://www.dggs.alaska.gov> for the latest information on available data. Please e-mail your questions and data requests when possible since our web site and e-mail address will remain current even if our phone number and mailing address change.

Why was the data set created?

At the time this project was published, the State of Alaska depended on the petroleum industry for approximately 80 percent of its revenue, most of which comes from oil fields on the North Slope. North Slope oil production is declining. This mapping project addresses this problem by providing the state and industry with the first published geologic map of this part of the North Slope oil province at a scale other than 1:2,500,000. Detailed geologic mapping of the quadrangle addresses the lack of understanding of the petroleum-geology framework of the eastern North Slope, Colville basin, and the stratigraphic transition from the National Petroleum Reserve in Alaska (NPRA) to the Arctic National Wildlife Refuge (ANWR). This detailed mapping and petroleum-related data is pertinent to oil exploration for Prudhoe Bay satellite fields and new play-type reevaluations, as well as assist private-sector exploration efforts, and speed the exploration process. This data will contribute to increased confidence in exploration and evaluation efforts in areas west of Prudhoe Bay.

How was the data set created?

  1. From what previous works were the data drawn?

    Ashley and others (1984) (source 1 of 12)
    Ashley, G.M., Hamilton, T.D., and Reed, K.M., 1984, Epiguruk bluff—Chronology and regional correlations: Geological Society of America Abstracts with Programs v. 16, Geological Society of America, Boulder, CO, USA.

    Other_Citation_Details: p. 267
    Type_of_Source_Media: paper
    Source_Contribution:
    These data were used to further define the geology of the Sagavanirktok B-1 area. See this publication cited in the Process Step section below.

    Detterman (1953) (source 2 of 12)
    Detterman, R.L., 1953, Sagavanirktok–Anaktuvuk region, northern Alaska:.

    This is part of the following larger work.

    Péwé, T.L. (ed.), Muller, E.H. (ed.), Karlstrom, T.N.V. (ed.), Krinsley, D.B. (ed.), Fernald, A.T. (ed.), Wahrhaftig, C. (ed.), Hopkins, D.M. (ed.), and Detterman, R.L. (ed.), 1953, Multiple glaciation in Alaska: Circular Circ. 289, U.S. Geological Survey, Washington, DC, USA.

    Other_Citation_Details: p. 11-12
    Type_of_Source_Media: paper
    Source_Contribution:
    These data were used to further define the surficial geology of the Sagavanirktok B-1 area. See this publication cited in the Process Step section below.

    Detterman and others (1958) (source 3 of 12)
    Detterman, R.L., Bowsher, A.L., and Dutro, J.T., Jr., 1958, Glaciation on the Arctic Slope of the Brooks Range, northern Alaska: Journal of the Arctic Institute of North America v. 11, Arctic, Calgary, Alberta, Canada.

    Other_Citation_Details: p. 43-61
    Type_of_Source_Media: paper
    Source_Contribution:
    These data were used to further define the surficial geology of the Sagavanirktok B-1 area. See this publication cited in the Process Step section below.

    Hamilton (1986) (source 4 of 12)
    Hamilton, T.D., 1986, Late Cenozoic glaciation of the central Brooks Range:.

    This is part of the following larger work.

    Hamilton, T.D. (ed.), Reed, K.M. (ed.), and Thorson, R.M. (ed.), 1986, Glaciation in Alaska: The geologic record: None None, Alaska Geological Society, Anchorage, AK, USA.

    Other_Citation_Details: p. 9-49
    Type_of_Source_Media: paper
    Source_Contribution:
    These data were used to further define the surficial geology of the Sagavanirktok B-1 area. See this publication cited in the Process Step section below.

    Ashley and others (1982) (source 5 of 12)
    Hamilton, T.D., 1982, A late Pleistocene glacial chronology for the southern Brooks Range—Stratigraphic record and regional significance: Geological Society of America Bulletin Bulletin 93, U.S. Geological Survey, Reston, VA, USA.

    Other_Citation_Details: p. 700-716
    Type_of_Source_Media: paper
    Source_Contribution:
    These data were used to further define the surficial geology of the Sagavanirktok B-1 area. See this publication cited in the Process Step section below.

    Porter and others (1983) (source 6 of 12)
    Porter, S.C., Pierce, K.L., and Hamilton, T.D., 1983, Late Wisconsin mountain glaciation in the western United States:.

    This is part of the following larger work.

    Porter, S.C., and Wright, H.E., Jr. (ed.), 1983, The Late Pleistocene: Late Quaternary Environments of the United States v. 1, University of Minnesota Press, Minneapolis, MN, USA.

    Other_Citation_Details: p. 71-111
    Type_of_Source_Media: paper
    Source_Contribution:
    These data were used to further define the surficial geology of the Sagavanirktok B-1 area. See this publication cited in the Process Step section below.

    Reifenstuhl (1995) (source 7 of 12)
    Reifenstuhl, R.R., 1995, Lithofacies, petrology, and petrophysics of the Kemik Sandstone (Lower Cretaceous), eastern Arctic Slope, Alaska:.

    This is part of the following larger work.

    Combellick, R.A. (ed.), and Tannian, F. (ed.), 1995, Short Notes on Alaska Geology 1995: Professional Report PR 117F, Alaska Division of Geological & Geophysical Surveys, Fairbanks, AK, USA.

    Online Links:

    Other_Citation_Details: p. 53-67
    Type_of_Source_Media: paper
    Source_Contribution:
    These data were used to further define the bedrock geology of the Sagavanirktok B-1 area. See this publication cited in the Process Step section below.

    Reifenstuhl (1994) (source 8 of 12)
    Reifenstuhl, R.R., 1994, Kemik Sandstone—petrology, physical properties, and facies of 40 outcrop and subsurface samples, Canning River to Sagavanirktok River, northeast North Slope, Alaska: U.S. Minerals Management Service Report No. 14-35-0001-30643, Alaska Division of Geological & Geophysical Surveys, Fairbanks, AK, USA.

    Other_Citation_Details: 2 sheets, scales 1:250,000, 1:300, 63 p.
    Type_of_Source_Media: paper
    Source_Contribution:
    These data were used to further define the bedrock geology of the Sagavanirktok B-1 area. See this publication cited in the Process Step section below.

    Reifenstuhl (1991a) (source 9 of 12)
    Reifenstuhl, R.R., 1991, Paleontology data from 29 outcrop samples of Late Cretaceous to Jurassic age, Sagavanirktok Quadrangle, northeastern Brooks Range, Alaska: Public Data File PDF 91-21B, Alaska Division of Geological & Geophysical Surveys, Fairbanks, AK, USA.

    Online Links:

    Other_Citation_Details: 1 sheet, scale 1:250,000, 11 p.
    Type_of_Source_Media: paper
    Source_Contribution:
    These data were used to further define the bedrock geology of the Sagavanirktok B-1 area. See this publication cited in the Process Step section below.

    Reifenstuhl (1991b) (source 10 of 12)
    Reifenstuhl, R.R., 1991, Biostratigraphic report of 12 Cretaceous to Jurassic age outcrop samples from the Sagavanirktok, Mt. Michelson, and Chandler Lake Quadrangles, North Slope: Public Data File PDF 91-21D, Alaska Division of Geological & Geophysical Surveys, Fairbanks, AK, USA.

    Online Links:

    Other_Citation_Details: 10 p.
    Type_of_Source_Media: paper
    Source_Contribution:
    These data were used to further define the bedrock geology of the Sagavanirktok B-1 area. See this publication cited in the Process Step section below.

    Waythomas (1991) (source 11 of 12)
    Waythomas, C.F., 1991, Surficial geologic map of the Sagavanirktok B-1 Quadrangle, northeastern Brooks Range, Alaska: Public Data File PDF 91-21E, Alaska Division of Geological & Geophysical Surveys, Fairbanks, AK, USA.

    Online Links:

    Other_Citation_Details: 1 sheet, scale 1:63,360, 5 p.
    Type_of_Source_Media: paper
    Source_Contribution:
    These data were used to further define the surficial geology of the Sagavanirktok B-1 area. See this publication cited in the Process Step section below.

    Wagner (1957) (source 12 of 12)
    Wagner, A.A., 1957, The use of the Unified Soil Classification System by the Bureau of Reclamation: Proceedings v. I, 4th International Conference on Soil Mechanics and Foundation Engineering, London, England.

    Other_Citation_Details: p. 125
    Type_of_Source_Media: paper
    Source_Contribution:
    These data were used to further define the surficial geology of the Sagavanirktok B-1 area. See this publication cited in the Process Step section below.

  2. How were the data generated, processed, and modified?

    Date: 1999 (process 1 of 5)
    Field work - Field work for bedrock investigations, including ridge traverses and examination of riverbank exposures, was conducted approximately between June 15 and July 10, 1999. Field notes and rock samples were compiled and collected throughout the Sagavanirktok B-1. Bedrock mapping involved using sources cited below. Bedrock mappers recorded observations on 1:50,000- and 1:63,360-scale topographic base maps, compiled onto a 1:50,000-scale mylar map after the field season ended. Field stations were located using hand held GPS units. Field station notes and GPS location data were manually entered into a spreadsheet.

    Data sources used in this process:

    • Reifenstuhl (1994)
    • Reifenstuhl (1995)
    • Reifenstuhl (1991a)
    • Reifenstuhl (1991b)

    Date: 1999 (process 2 of 5)
    Fieldwork - Fieldwork for surficial geologic investigations, including ridge and valley traverses, road cut investigations, and river exposures, was conducted for approximately 5 person-days during June 21-25, 1999 by a surficial geologist. Field notes and sediment samples were collected throughout the area for surficial investigations. Surficial mapping involved using sources cited below on a regular basis for checking and correlating general units. The surficial mapper recorded observations on co-registered acetate overlays on 1:50,000-scale (nominal) color-infrared aerial photographs (Alaska High Altitude Aerial Photography, 1978, 1982), and directly on 1:63,360-scale topographic base maps. Stations were located using air photos and topographic maps.

    Data sources used in this process:

    • Ashley and others (1984)
    • Detterman (1953)
    • Detterman and others (1958)
    • Hamilton (1986)
    • Hamilton (1982)
    • Porter and others (1983)
    • Waythomas (1991)

    Date: 1999 (process 3 of 5)
    Laboratory data - See the report RI 2000-1A for more information.

    Date: 1999 (process 4 of 5)
    Photo interpretation - Before, during, and after field work, surficial-geologic information was interpreted using 1:50,000-scale (nominal) color-infrared air-photo stereopairs, and compiled onto acetate overlays. Photo interpretation was based on field notes from fieldwork process step (above), observed land forms and relationships in the photos, and all known geologic data from previous work in the area. The main sources of existing data include the references listed below. The overlay information was transferred to a paper 1:63,360-scale USGS topographic base using a zoom transfer scope.

    Data sources used in this process:

    • Ashley and others (1984)
    • Detterman (1953)
    • Detterman and others (1958)
    • Hamilton (1986)
    • Hamilton (1982)
    • Porter and others (1983)
    • Waythomas (1991)

    Date: 2000 (process 5 of 5)
    Digital Cartography - Surficial-geologic information was digitized from the paper USGS topographic base map into Arc/Info 7.0.4 GIS (ArcEdit module) using a large-format digitizing table. Surficial-geologic polygons and lines were then edited and attributed using Arc, Info, and ArcEdit. Bedrock point data of locations of structural observations (strike, dip, cleavage, jointing, etc.) were intersected with the surficial-geologic polygon coverage using the Arc command "intersect" in order to identify locations that were mapped as surficial materials based on aerial photography but were found to have small exposures that were desirable to be mapped as bedrock. These areas were then modified in the surficial-geologic coverages to be areas of bedrock exposure. Final bedrock and surficial geology polygon coverages were merged using the Arc command "union" to generate the polygon coverage used to make the comprehensive geologic map. Other cartographic elements, primarily text and tables, were created in CorelDraw, converted to CGM format, and imported into ArcPlot for final layout. Data from the comprehensive geologic map of the area were used as the basis for generating the derivative engineering-geologic map. An ArcInfo lookup table was made to assign geologic units (item UNIT) from the comprehensive map to appropriate engineering-geologic units (item MAT) based on the Unified Soil Classification System as described by Wagner (1957). This lookup table was applied to the ArcInfo polygon coverage containing the geologic units and a new engineering-geologic polygon coverage was generated using the "dissolve" command based on the new materials-unit item "MAT." Additional features were mapped from ground observations and interpretation of air photos, and digitized and attributed using ArcInfo. ArcPlot was used to generate plot files of the resulting materials coverage using DGGS-standard symbology.

    Data sources used in this process:

    • Wagner (1957)

  3. What similar or related data should the user be aware of?

    Reifenstuhl, R.R., Mull, C.G., Harris, E.E., LePain, D.L., Wallace, W.K., and Pinney, D.S., 2000, Interpretive bedrock geologic map of the Sagavanirktok B-1 Quadrangle, eastern North Slope, Alaska: Report of Investigation RI 2000-1B, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, AK.

    Online Links:

    Other_Citation_Details: Scale 1:63,360
    Pinney, D.S., 2000, Reconnaissance surficial-geologic map of the Sagavanirktok B-1 Quadrangle, eastern North Slope, Alaska: Report of Investigation RI 2000-1C, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, AK.

    Online Links:

    Other_Citation_Details: Scale 1:63,360
    Pinney, D.S., 2000, Reconnaissance engineering-map of the Sagavanirktok B-1 Quadrangle, eastern North Slope, Alaska: Report of Investigation RI 2000-1D, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, AK.

    Online Links:

    Other_Citation_Details: Scale 1:63,360

How reliable are the data; what problems remain in the data set?

  1. How well have the observations been checked?

    Location data for geologic and comprehensive point layers were entered manually from GPS units into a spreadsheet. Data for surficial and materials point, line, and polygon layers were determined in the field using 1:63,360-scale topographic maps and 1:50,000 (nominal) scale, color-infrared aerial photographs. Geologic data included in the compilation are the field maps and notes from this project as well as data from other sources as noted in the "Sources Cited" section. Attributes were verified for consistency and completeness during the creation of the metadata.

  2. How accurate are the geographic locations?

    DGGS location data and estimated position errors were manually entered into a spreadsheet. Sample numbers and locations with selected data were spatially registered and analyzed in ArcGIS software. Location data for the surficial and materials maps were determined visually using topographic maps at a scale of 1:63,360 and 1:50,000 (nominal) scale, color-infrared aerial photographs. See "Source_Information" section for horizontal positional accuracy of locations not measured by DGGS.

  3. How accurate are the heights or depths?

  4. Where are the gaps in the data? What is missing?

    This dataset includes coverages that contain information about geologic units, their ages, and field sample locations; structural features; structural measurements; and locations of industry-drilled test wells at 1:63,360 scale

  5. How consistent are the relationships among the observations, including topology?

    Topology is present on appropriate polygon and line layers; others are point layers.

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?

Access_Constraints:
This report, map, and/or dataset are available directly from the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (see contact information below).
Use_Constraints:
Any hard copies or published datasets utilizing these datasets shall clearly indicate their source. If the user has modified the data in any way, the user is obligated to describe the types of modifications the user has made. User specifically agrees not to misrepresent these datasets, nor to imply that changes made by the user were approved by the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys.

  1. Who distributes the data set? (Distributor 1 of 1)

    State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys
    Natural Resource Technician
    3354 College Road
    Fairbanks, AK 99709-3707
    USA

    907-451-5020 (voice)
    907-451-5050 (FAX)
    dggspubs@alaska.gov

    Hours_of_Service: 8 am to 4:30 pm, Monday through Friday, except State holidays
    Contact_Instructions:
    Please view our web site (<http://www.dggs.alaska.gov>) for the latest information on available data. Please contact us using the e-mail address provided above when possible.
  2. What's the catalog number I need to order this data set?

    Report of Investigation 2000-1A

  3. What legal disclaimers am I supposed to read?

    The State of Alaska makes no express or implied warranties (including warranties of merchantability and fitness) with respect to the character, function, or capabilities of the electronic services or products or their appropriateness for any user's purposes. In no event will the State of Alaska be liable for any incidental, indirect, special, consequential, or other damages suffered by the user or any other person or entity whether from the use of the electronic services or products, any failure thereof, or otherwise, and in no event will the State of Alaska's liability to the requester or anyone else exceed the fee paid for the electronic service or product.

  4. How can I download or order the data?

  5. What hardware or software do I need in order to use the data set?

    Please check the MapInfo web site (<http://www.mapinfo.com/>) for the latest documentation on importing ESRI shape files.

Who wrote the metadata?

Dates:
Last modified: 06-May-2008
Last Reviewed: 06-May-2008
To be reviewed: 25-May-2009
Metadata author:
State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys
Metadata Manager
3354 College Road
Fairbanks, AK 99709-3707
USA

907-451-5039 (voice)
907-451-5050 (FAX)
dggspubs@alaska.gov

Hours_of_Service: 8 am to 4:30 pm, Monday through Friday, except State holidays.
Contact_Instructions:
Please contact us through the e-mail address above whenever possible.
Metadata standard:
FGDC Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)

Generated by mp version 2.9.6 on Tue May 06 14:29:38 2008